linux-kernel - [patch v2] md/raid0: fix uninitialized variable bug

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Message-ID: <20160414093149.GA16549@mwanda>
Date:	Thu, 14 Apr 2016 12:31:49 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Shaohua Li <shli@...nel.org>
Cc:	linux-raid@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [patch v2] md/raid0: fix uninitialized variable bug

If this function fails the callers expect that *private_conf is set to
an ERR_PTR() but that isn't true for the first error path where we can't
allocate "conf".  It leads to some uninitialized variable bugs.

Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
---
v2: Shaohua suggested a different fix

diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c
index 2ea12c6..f63dbb6 100644
--- a/drivers/md/raid0.c
+++ b/drivers/md/raid0.c
@@ -85,6 +85,7 @@ static int create_strip_zones(struct mddev *mddev, struct r0conf **private_conf)
 	struct r0conf *conf = kzalloc(sizeof(*conf), GFP_KERNEL);
 	unsigned short blksize = 512;
 
+	*private_conf = ERR_PTR(-ENOMEM);
 	if (!conf)
 		return -ENOMEM;
 	rdev_for_each(rdev1, mddev) {